Hidden Field For ACF (Advanced Custom Fields) WordPress Plugin
for Use Custom JavaScript Action in Input, use acf_hidden_field_custom_script
action:
add_action('acf_hidden_field_custom_script', 'add_default_value');
function add_default_value($field) {
?>
<script>
jQuery(document).ready(function ($) {
/**
* https://www.advancedcustomfields.com/resources/javascript-api/
*/
acf.addAction('load', function () {
let input = $("#acf-<?php echo $field['key']; ?>");
if (input.val().length < 1) {
input.val("a new value");
}
});
});
</script>
<?php
});